335 lines
8.8 KiB
C
335 lines
8.8 KiB
C
/*
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* For Philips TEA5767 FM Chip used on some TV Cards like Prolink Pixelview
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* I2C address is allways 0xC0.
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*
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* $Id: tea5767.c,v 1.11 2005/06/21 15:40:33 mchehab Exp $
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*
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* Copyright (c) 2005 Mauro Carvalho Chehab (mchehab@brturbo.com.br)
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* This code is placed under the terms of the GNU General Public License
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*
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* tea5767 autodetection thanks to Torsten Seeboth and Atsushi Nakagawa
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* from their contributions on DScaler.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <linux/timer.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/videodev.h>
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#include <linux/i2c.h>
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#include <linux/i2c-algo-bit.h>
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#include <media/tuner.h>
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/* Declared at tuner-core.c */
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extern unsigned int tuner_debug;
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#define PREFIX "TEA5767 "
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/*****************************************************************************/
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/******************************
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* Write mode register values *
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******************************/
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/* First register */
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#define TEA5767_MUTE 0x80 /* Mutes output */
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#define TEA5767_SEARCH 0x40 /* Activates station search */
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/* Bits 0-5 for divider MSB */
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/* Second register */
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/* Bits 0-7 for divider LSB */
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/* Third register */
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/* Station search from botton to up */
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#define TEA5767_SEARCH_UP 0x80
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/* Searches with ADC output = 10 */
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#define TEA5767_SRCH_HIGH_LVL 0x60
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/* Searches with ADC output = 10 */
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#define TEA5767_SRCH_MID_LVL 0x40
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/* Searches with ADC output = 5 */
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#define TEA5767_SRCH_LOW_LVL 0x20
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/* if on, div=4*(Frf+Fif)/Fref otherwise, div=4*(Frf-Fif)/Freq) */
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#define TEA5767_HIGH_LO_INJECT 0x10
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/* Disable stereo */
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#define TEA5767_MONO 0x08
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/* Disable right channel and turns to mono */
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#define TEA5767_MUTE_RIGHT 0x04
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/* Disable left channel and turns to mono */
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#define TEA5767_MUTE_LEFT 0x02
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#define TEA5767_PORT1_HIGH 0x01
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/* Forth register */
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#define TEA5767_PORT2_HIGH 0x80
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/* Chips stops working. Only I2C bus remains on */
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#define TEA5767_STDBY 0x40
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/* Japan freq (76-108 MHz. If disabled, 87.5-108 MHz */
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#define TEA5767_JAPAN_BAND 0x20
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/* Unselected means 32.768 KHz freq as reference. Otherwise Xtal at 13 MHz */
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#define TEA5767_XTAL_32768 0x10
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/* Cuts weak signals */
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#define TEA5767_SOFT_MUTE 0x08
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/* Activates high cut control */
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#define TEA5767_HIGH_CUT_CTRL 0x04
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/* Activates stereo noise control */
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#define TEA5767_ST_NOISE_CTL 0x02
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/* If activate PORT 1 indicates SEARCH or else it is used as PORT1 */
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#define TEA5767_SRCH_IND 0x01
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/* Fiveth register */
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/* By activating, it will use Xtal at 13 MHz as reference for divider */
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#define TEA5767_PLLREF_ENABLE 0x80
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/* By activating, deemphasis=50, or else, deemphasis of 50us */
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#define TEA5767_DEEMPH_75 0X40
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/*****************************
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* Read mode register values *
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*****************************/
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/* First register */
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#define TEA5767_READY_FLAG_MASK 0x80
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#define TEA5767_BAND_LIMIT_MASK 0X40
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/* Bits 0-5 for divider MSB after search or preset */
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/* Second register */
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/* Bits 0-7 for divider LSB after search or preset */
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/* Third register */
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#define TEA5767_STEREO_MASK 0x80
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#define TEA5767_IF_CNTR_MASK 0x7f
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/* Four register */
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#define TEA5767_ADC_LEVEL_MASK 0xf0
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/* should be 0 */
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#define TEA5767_CHIP_ID_MASK 0x0f
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/* Fiveth register */
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/* Reserved for future extensions */
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#define TEA5767_RESERVED_MASK 0xff
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/*****************************************************************************/
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static void set_tv_freq(struct i2c_client *c, unsigned int freq)
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{
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struct tuner *t = i2c_get_clientdata(c);
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tuner_warn("This tuner doesn't support TV freq.\n");
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}
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static void tea5767_status_dump(unsigned char *buffer)
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{
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unsigned int div, frq;
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if (TEA5767_READY_FLAG_MASK & buffer[0])
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printk(PREFIX "Ready Flag ON\n");
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else
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printk(PREFIX "Ready Flag OFF\n");
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if (TEA5767_BAND_LIMIT_MASK & buffer[0])
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printk(PREFIX "Tuner at band limit\n");
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else
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printk(PREFIX "Tuner not at band limit\n");
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div=((buffer[0]&0x3f)<<8) | buffer[1];
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switch (TEA5767_HIGH_LO_32768) {
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case TEA5767_HIGH_LO_13MHz:
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frq = 1000*(div*50-700-225)/4; /* Freq in KHz */
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break;
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case TEA5767_LOW_LO_13MHz:
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frq = 1000*(div*50+700+225)/4; /* Freq in KHz */
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break;
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case TEA5767_LOW_LO_32768:
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frq = 1000*(div*32768/1000+700+225)/4; /* Freq in KHz */
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break;
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case TEA5767_HIGH_LO_32768:
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default:
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frq = 1000*(div*32768/1000-700-225)/4; /* Freq in KHz */
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break;
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}
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buffer[0] = (div>>8) & 0x3f;
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buffer[1] = div & 0xff;
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printk(PREFIX "Frequency %d.%03d KHz (divider = 0x%04x)\n",
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frq/1000,frq%1000,div);
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if (TEA5767_STEREO_MASK & buffer[2])
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printk(PREFIX "Stereo\n");
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else
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printk(PREFIX "Mono\n");
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printk(PREFIX "IF Counter = %d\n",buffer[2] & TEA5767_IF_CNTR_MASK);
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printk(PREFIX "ADC Level = %d\n",(buffer[3] & TEA5767_ADC_LEVEL_MASK)>>4);
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printk(PREFIX "Chip ID = %d\n",(buffer[3] & TEA5767_CHIP_ID_MASK));
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printk(PREFIX "Reserved = 0x%02x\n",(buffer[4] & TEA5767_RESERVED_MASK));
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}
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/* Freq should be specifyed at 62.5 Hz */
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static void set_radio_freq(struct i2c_client *c, unsigned int frq)
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{
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struct tuner *t = i2c_get_clientdata(c);
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unsigned char buffer[5];
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unsigned div;
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int rc;
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if ( tuner_debug )
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printk(PREFIX "radio freq counter %d\n",frq);
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/* Rounds freq to next decimal value - for 62.5 KHz step */
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/* frq = 20*(frq/16)+radio_frq[frq%16]; */
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buffer[2] = TEA5767_PORT1_HIGH;
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buffer[3] = TEA5767_PORT2_HIGH | TEA5767_HIGH_CUT_CTRL | TEA5767_ST_NOISE_CTL | TEA5767_JAPAN_BAND;
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buffer[4]=0;
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if (t->audmode == V4L2_TUNER_MODE_MONO) {
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tuner_dbg("TEA5767 set to mono\n");
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buffer[2] |= TEA5767_MONO;
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} else
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tuner_dbg("TEA5767 set to stereo\n");
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switch (t->type) {
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case TEA5767_HIGH_LO_13MHz:
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tuner_dbg("TEA5767 radio HIGH LO inject xtal @ 13 MHz\n");
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buffer[2] |= TEA5767_HIGH_LO_INJECT;
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buffer[4] |= TEA5767_PLLREF_ENABLE;
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div = (frq*4/16+700+225+25)/50;
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break;
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case TEA5767_LOW_LO_13MHz:
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tuner_dbg("TEA5767 radio LOW LO inject xtal @ 13 MHz\n");
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buffer[4] |= TEA5767_PLLREF_ENABLE;
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div = (frq*4/16-700-225+25)/50;
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break;
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case TEA5767_LOW_LO_32768:
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tuner_dbg("TEA5767 radio LOW LO inject xtal @ 32,768 MHz\n");
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buffer[3] |= TEA5767_XTAL_32768;
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/* const 700=4000*175 Khz - to adjust freq to right value */
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div = (1000*(frq*4/16-700-225)+16384)>>15;
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break;
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case TEA5767_HIGH_LO_32768:
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default:
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tuner_dbg("TEA5767 radio HIGH LO inject xtal @ 32,768 MHz\n");
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buffer[2] |= TEA5767_HIGH_LO_INJECT;
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buffer[3] |= TEA5767_XTAL_32768;
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div = (1000*(frq*4/16+700+225)+16384)>>15;
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break;
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}
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buffer[0] = (div>>8) & 0x3f;
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buffer[1] = div & 0xff;
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if ( tuner_debug )
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tea5767_status_dump(buffer);
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if (5 != (rc = i2c_master_send(c,buffer,5)))
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tuner_warn("i2c i/o error: rc == %d (should be 5)\n",rc);
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}
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static int tea5767_signal(struct i2c_client *c)
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{
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unsigned char buffer[5];
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int rc;
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struct tuner *t = i2c_get_clientdata(c);
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memset(buffer,0,sizeof(buffer));
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if (5 != (rc = i2c_master_recv(c,buffer,5)))
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tuner_warn ( "i2c i/o error: rc == %d (should be 5)\n",rc);
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return ((buffer[3] & TEA5767_ADC_LEVEL_MASK) <<(13-4));
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}
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static int tea5767_stereo(struct i2c_client *c)
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{
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unsigned char buffer[5];
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int rc;
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struct tuner *t = i2c_get_clientdata(c);
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memset(buffer,0,sizeof(buffer));
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if (5 != (rc = i2c_master_recv(c,buffer,5)))
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tuner_warn ( "i2c i/o error: rc == %d (should be 5)\n",rc);
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rc = buffer[2] & TEA5767_STEREO_MASK;
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if ( tuner_debug )
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tuner_dbg("TEA5767 radio ST GET = %02x\n", rc);
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return ( (buffer[2] & TEA5767_STEREO_MASK) ? V4L2_TUNER_SUB_STEREO: 0);
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}
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int tea_detection(struct i2c_client *c)
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{
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unsigned char buffer[5]= { 0xff, 0xff, 0xff, 0xff, 0xff };
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int rc;
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struct tuner *t = i2c_get_clientdata(c);
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if (5 != (rc = i2c_master_recv(c,buffer,5))) {
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tuner_warn ( "it is not a TEA5767. Received %i chars.\n",rc );
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return EINVAL;
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}
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/* If all bytes are the same then it's a TV tuner and not a tea5767 chip. */
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if (buffer[0] == buffer[1] && buffer[0] == buffer[2] &&
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buffer[0] == buffer[3] && buffer[0] == buffer[4]) {
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tuner_warn ( "All bytes are equal. It is not a TEA5767\n" );
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return EINVAL;
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}
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/* Status bytes:
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* Byte 4: bit 3:1 : CI (Chip Identification) == 0
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* bit 0 : internally set to 0
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* Byte 5: bit 7:0 : == 0
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*/
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if (!((buffer[3] & 0x0f) == 0x00) && (buffer[4] == 0x00)) {
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tuner_warn ( "Chip ID is not zero. It is not a TEA5767\n" );
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return EINVAL;
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}
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tuner_warn ( "TEA5767 detected.\n" );
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return 0;
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}
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int tea5767_tuner_init(struct i2c_client *c)
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{
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struct tuner *t = i2c_get_clientdata(c);
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if (tea_detection(c)==EINVAL) return EINVAL;
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tuner_info("type set to %d (%s)\n",
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t->type, TEA5767_TUNER_NAME);
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strlcpy(c->name, TEA5767_TUNER_NAME, sizeof(c->name));
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t->tv_freq = set_tv_freq;
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t->radio_freq = set_radio_freq;
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t->has_signal = tea5767_signal;
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t->is_stereo = tea5767_stereo;
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return (0);
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}
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